I know the basics commands, command substitution, redirection, pipelines, and I know about .bashrc, .vimrc etc. but I feel like I still don't know a lot and I feel a bit lost as to where to learn more. I know I'm being a bit vague, but that's on purpose, I don't really know what's possible. feel free to suggest any book or resource that you think would help me learn more about linux (I also haven't been keeping up with it lately, so any new stuff like what's NixOS would help)

Many of you are probably familiar with Show HNs from HackerNews. Perhaps we are not yet big enough to share those as regular top-level posts, and it is also hard to distinguish between plain self-promotions — it might thus suit us better to have these in a more controlled way.

If you are interested in sharing your project, please send a top-level comment as a reply. Probably sticking to HN’s relevant ruling will be a good starting point, paraphrasing the especially important parts:

[Show ~] is for something you've made that other people can play with. [Tildes] users can try it out, give you feedback, and ask questions in the thread. The project must be something you've worked on personally and which you're around to discuss.

A [Show ~] needn't be complicated or look slick. The community is comfortable with work that's at an early stage.

Please make it easy for users to try your thing out, ideally without barriers such as signups or emails. You'll get more feedback that way.

If your work isn't ready for users to try out, please don't do a [Show ~]

:wave: everyone, I've been thinking about where to put non-technical blog posts and what to call them since, so far, I have bookmark/, cheatsheet/, howto/, note/, snippet/ and tutorial/ folders already[1].

I think those cover most of the things I like writing about and I intend to share, but I also enjoy poetry, analyzing movies, political commentary and writing an essay here and there.

Following from that, I kept essay/, poem/ and commentary/ around for whenever I felt like sharing some of my non-technical writings, but I don't like those folders :smile:. They seem way too granular, more akin to tags than categories, both of which are contained in each file's metadata.

Tags, however, don't feel like a "pillar"/category of a Zettelkasten/ramblings/thoughts crate. They're empty at the moment and in draft/, so it's the perfect chance to do some re-structuring and avoid the issues I faced when I ditched blog/category and chose the current structure.

In case you're asking yourself why I didn't put everything in the same folder, as they reflect categories and each .md file has category metadata already, it's because the drafts in draft/ became unmanageable (+120). So, in an effort to give myself an easier way to navigate and edit, I decided /folders were going to reflect the categories that existed. I'm aware it can be that after note #50 or something I have the same problem, and thus it wouldn't have made a difference whether notes were together with tutorials or not. I've decided to deal with that problem when it arises :)

I'd be very interested in hearing your thoughts! Would you keep essay/, poem/ and commentary/ or merge them into something else? note/ are short and wouldn't feel right for longer ramblings. I am not a big fan of writings/ as everything is a "writing", prose/ also doesn't quite fit and so far the only one I've sort of liked is reflection/ since essays, poems, and comments on happenings are the result of reflecting.

/rant over, I know, I'm overthinking it. Let those not guilty throw the first stone :)

[1] I've removed quite a bit of the irrelevant stuff but kept what I believe is relevant, but feel free to ask away in case something necessary is missing.

.
├── bookmark/
│   └── sample.md
├── cheatsheet/
│   ├── sample.md
│   └── sample.md-data
├── commentary/
├── draft/
│   ├── bookmark/
│   │   └── sample.md
│   ├── cheatsheet/
│   │   └── sample.md
│   └── ...
├── essay/
├── extra/
│   ├── archive/
│   ├── blob/
│   └── robots.txt
├── howto/
│   └── sample.md
├── note/
│   └── sample.md
├── poem
├── private/
│   └── sample.md
├── snippet/
│   └── sample.md
└── tutorial/
    ├── sample.md
    └── sample.md-data/
        ├── sample.png
        └── ...

So I have an old MacBook Pro (mid-2014) Core i5 which I've just installed Ubuntu 22.04.2 on. Most things are working fine but the screen randomly flickers and then goes black and then after varying lengths of time will pop back on again. I've been googling around and found lots of instances of similar graphics glitches but can't quite find a solution.

Any suggestions?

As a not quite "old man" I was wondering how many former BBS sysops are here?

In the early-mid 90s, I used to run a single line PCBoard powered hobby BBS and dabble in making PPEs (PCBoards programming language for plug ins/mods). I also help friends set up SpitFire, Searchlight, Synchronet, WWIV and Aftershock (total PITAs from what I remember)--basically anything free, crackable or unlimited trial.

Since I was the only sysop that ran PCBoard I was invited to become an officer in our local User Group to run their whopping 3 line BBS and give classes (that was quite the technological achievement back then). That is something I truly do miss. I was, by far, the youngest member of the User Group (your average member probably had grandkids my age) but it was a meritocracy.

People seemed eager to learn and share information as they found it. Before computers, 3d cards and the internet was ubiquitous, you were automatically accepted into a knowing crowd if you put in the effort/time to join a BBS, forum or (early) MMO. Exclusion brought inclusion, if that makes sense. If you torched your reputation by acting like a jackass it was difficult to move on like a locust to another area.

So many stories. So many high jinks that would be deemed illegal today, lol.

Everything that is old, is new again.

I'm getting a lot of BBS vibes in the aftermath of Rexxit. The slower pace of Tildes reminds me so much of the BBS forums (while I know Tildes isn't new, it is growing in popularity in the aftermath.) Even the Fediverse harkens back to the days of early BBS synch nets.

Now if only I could find a modern remake of Tradwars 2002.

General Programming Q&A thread! Ask any questions about programming, answer the questions of other users, or post suggestions for future threads.

Don't forget to format your code using the triple backticks or tildes:

Here is my schema:

```sql
CREATE TABLE article_to_warehouse (
  article_id   INTEGER
, warehouse_id INTEGER
)
;
```

How do I add a `UNIQUE` constraint?

This is a recurring post to discuss programming or other technical projects that we've been working on. Tell us about one of your recent projects, either at work or personal projects. What's interesting about it? Are you having trouble with anything?

Where do you find volunteers to help with open source projects? Such as:

• https://www.codeshelter.co
• https://hacktoberfest.com
• https://summerofcode.withgoogle.com

For example, with KeenWrite, I'm looking for help help with a specific feature that could be applicable to a wide audience (i.e., academia and technical writers). The lion's share of the effort for cross-references would be an extension or change to the flexmark-java library: parsing a de facto standard cross-reference syntax, rather than direct changes to my text editor.

I've been experimenting with Ubuntu and Mint on VirtualBox for a few days, and I fail to see the utility for less tech savvy people such as myself. I have experience in HTML and CSS as well as dabbling in Codecademy for recreation, but higher level computing is new to me. I don't know how to navigate a terminal nor how to stop Windows from crashing, but I'm open to learn.

I had to use the Arch Linux live boot usb today and I was pleasantly surprised to hear a short beepy music play when it got booted. It felt quite welcoming!

In my particular case, it served quite useful too as my laptop currently does not have an internal display, and nothing shows up on the external HDMI monitor until after the OS boots up, so it was quite reassuring as well.

I have now configured my GRUB to play a small sound as well (since I have multiple bootloaders installed).

How To

1. You need to edit the config file /etc/default/grub.
2. If you simply un-comment the line starting with GRUB_INIT_TUNE, it will enable the default tune which is a single and very short "beep" sound.
3. Or, you can edit that line to have it how you want. Some suggestions: https://jdnash.com/api-makers/grub_init_tune-necropolis/
4. Then update the grub config (requires root): grub-mkconfig -o /boot/grub/grub.cfg

And you're done.

Relevant Arch Wiki: https://wiki.archlinux.org/title/GRUB/Tips_and_tricks#Play_a_tune

I'm familiar with how the ranking algorithms work on a high level. What I'm curious about is to how those algorithms are actually applied.

How do these platforms actually apply the ranking algorithms so that the user sees the threads appropriately ordered? My knowledge is limited to PHP and MySQL, so I'm looking at it through the lense of those systems. I've thought of a few possible ways, but all of them seem pretty resource intensive.

1. Maintain a table of threads with all relevant information required to calculate ranking, as well as ranking itself. A server side script executing on a routine basis every X minutes (cron job?) updates the rankings on all the threads, so they can be easily ordered. However, people most likely don't care about threads >Y days old, so those can be excluded or automatically deranked somehow.

2. Maintain a table of threads with all relevant information required to calculate ranking. When a user visits, the last X threads (again, users probably don't care about really old stuff) are pulled out of the database and ran through a ranking and sorting algorithm, reordered and displayed to the user. This seems the most resource intensive?

I am by no means a professional developer, but I've been dabbling recently and the concept of how these large quantities of data are ranked both perplexes and interests me.

I have a little web app running on Deno Deploy and I want to see how it handles people connecting from multiple regions. There's a BroadcastChannel class that lets you send messages to any servers running in other regions, but to test it, I need to make connections in multiple regions, so there's more than one server running.

What are good ways to test this, either interactively or by writing tests? Maybe use a VPN? What's your favorite?

Previously I used to have this in my .vimrc:

if !exists('g:lasttab')
  let g:lasttab = 1
endif
nmap <C-Tab> :exe "tabn ".g:lasttab<CR>
au TabLeave * let g:lasttab = tabpagenr()

Courtesy of: https://stackoverflow.com/a/2120168

But while going through the help docs today, I stumbled across this mapping and am glad to find that this now exists by default. When it got added, however, I don't know.

Hey y’all. Recently picked up a Cyberpower prebuilt. Looking to install a Linux distro on it for gaming. Currently have Ubuntu on my laptop, so I’m not a total noob, but my experience is still low. Not a big fan of having to use the terminal. Any distros y’all would recommend? Am leaning toward Pop_OS or SteamOS.

I'm starting grad school in neuroscience/biomedical engineering soon, and one of my most dreaded parts of it is inevitably having to develop Matlab code. I understand why people use it -- it's arguably best in class at a lot of engineering tasks, and the matrix-first approach of the language makes it very fast to prototype things if you think like a mathematician/engineer.

However, the language also seems to actively discourage good software practices, and many frequently used scientific projects have atrocious code. Think python dependency management is bad? How about NO DEPENDENCY MANAGEMENT? Yes, that's right, the way you share code in matlab is by importing collections of loose files from github/matlab file exchange. The Matlab neuroimaging code that I have worked has also frequently abused the workspace to share state implicitly between scripts, which makes the code virtually incomprehensible. Instead of using packages to create namespaces, common practice is give function names a prefix and import them into the global namespace.

I know there's multiple large companies that rely on Matlab for their products, so it must be doable; I just haven't seen it for myself yet.

Do you guys have any experience developing in Matlab, and if so, are there any good resources to learn how to build robust software in it? What are some open source projects that have good Matlab code?

I cannot push nor pull to/from my local repo to/from my remote. I get the message "Your branch and 'origin/main' have diverged", etc.

I will be able to fix it, I'm already in the process of refreshing my memory on how to rebase this cleanly.

But ... I am the only person working on this. I have only one local and one central/remote repository. And I never made a branch.

It's just me, working on one computer, right here ... make a few commits locally, then push 'em ... make a few commits locally, then push 'em. That is my entire workflow.

How in the hell did I end up with "my branch" (???) and the origin/main branch being in conflict with each other?

Any Git gurus care to take a stab at this?

Thanks in advance.

Edit, more info:

I am guessing here, but for awhile I was working in a VM on my local machine ... but Android SDK is too much of a resource hog, so I committed and pushed everything on the VM, shut it down, and then pulled latest down to my actual machine ... or at least, that's how I remember it.

My working theory is that, somehow, I screwed up that "switching between machines" process, although, so far, no clue as to how/why I did.

Theory #2 is that Android SDK did something sneaky/stupid behind the scenes -- my last several commits have been done through the Android Studio IDE, not directly in the terminal.

Last Edit:

D'oh!

Found it. I made a couple of "quick changes" to the project's README.md file directly in the remote forge, and that's what screwed me up.

The history of the web is littered with with many a dead image/video hosting service. Echos of their existence plague older forums in the form of broken links and images. It seems like they all follow the same path, starting up as the new "simple" service that just hosts images, no fuss. But then as interest grows, so do costs, and the service owners have to scramble to monetize. Generally this is done by stuffing the place full of ads until everyone leaves. Alternatively the owners are stubborn and stick to their guns, until they inevitably have to shut down due to drowning in costs. When they do shut down, millions of assets are lost and the graveyard of broken images across the web grows some more.

https://gfycat.com/ is the latest notable victim of this.

With all the recent social media turmoil, there as been lots of exploration of alternative sites, and all of them have to overcome the problem of hosting media in one way or another.

Tildes obviously does this by avoiding it entirely which, while a very effective solution, is just handballing the problem elsewhere. Users will still want to post images and videos but they will just have to find alternative hosts. Over time those hosts will die and Tildes posts will be filled with dead links.

Mastodon has similar problems,the biggest cost of hosting a mastodon instance is the storage and bandwidth required to facilitate media posts. And there's a real danger of an instance incurring high costs if a particular post becomes popular and is hotlinked on a big centralised social media site.

It seems like a really tricky problem to solve, something peer-to-peer could sort of solve the costs created by traffic peaks but has problems when there is many small files viewed by few individuals each.

Are there any other solutions out there? Web3, IPFS? Or is it just not that much of a problem, do we accept that media on the web is ephemeral and will be lost after a while?

This is a recurring post to discuss programming or other technical projects that we've been working on. Tell us about one of your recent projects, either at work or personal projects. What's interesting about it? Are you having trouble with anything?

Hey there! Any web developers/designers out there that have resources on creating websites that are fully accessible? I am getting back into web development after a decade away and want to learn the correct way. Thanks for any tips!

Self-hosting has been a rabbit hole of wonder that I've explored and delved into over these past few months. I'm curious to hear what others use it for, what apps they love, and their rationale for doing so?

I'll go first.

First, in terms of rationale, this is a wonderful article that I think is worth checking out that encapsulates much my of ethos about pursuing self-hosting.

https://kylechayka.substack.com/p/essay-the-digital-death-of-collecting

The TL;DR is that we no longer have control over the things that we 'own' digitally for these massive cloud companies. For instance the songs / artists you listen to on Spotify may suddenly and unexpectedly become unavailable, certain things (most recently podcasts) may be forced upon you in unpleasant ways. Having complete control of your digital data is a very liberating feeling.

In terms of apps:

Hyperbackup - I use a synology NAS, so hyperbackup has been wonderful and use both external HD's and a cloud interface to create encrypted backups of everything which gives me peace of mind.

Plex - One of my most used apps, being able to stream anything remotely has been a dream. Plexamp has given me back control of my music library in a way I never thought I would have.

Tautulli - Great for more informatics on my plex usage

Calibre / Calibreweb - Phenomenal for keeping track of my book collections

PiHole - Ads be gone!

*Arr apps - Specifically Sonarr/Prowlarr/Radarr, really like Overseerr for an interface tying everything together

Daily Notes - A clean interface for keeping regular notes

Some things that I'm not currently self-hosting but would love to hear if others are using alternatives...

Instapaper - I know there are a few similar FOSS apps out there but haven't found one as convenient and well laid out

TickTick - To do app, but similarly haven't found a FOSS alternative that was as robust and nice to use

OneNote

Back in the day I remember setting up squirrelmail + qmail to host my own email as well as for others. And then I got that coveted gmail invite and never really looked back.

I've started to get into the mindset of erasing my digital trail, at least for my personal activities, and email seems to be the main one that I need to figure out.

The idea of setting up my own email solution came up again because I wonder how transparent / private services like protonmail and mailbox.org really are.

Any suggestions or insight would be appreciated. Squirrelmail seems to be now defunct, and I am pretty sure the world has changed enough that residential ISPs don't allow running of servers at home anymore. I guess I could setup something on AWS if I had to.

So, I'm using Arch i3wm. I have multiple copies of my /home/username (I am the sole user), and I have a "Spare" drive with media, games, and other goodies, some of which are also stored on partitions on the m.2 in question, but they have backups.

And the reason I ask this question is because while I've had my m.2 fail at the end of '21 (I didn't even know that was a thing, but it barely lasted a year, and things are acting shoddy now... though the original failed without a warning), I just bought a second m.2 for my games. I guess I could swap most of the whole thing over, but I know the boot partition is easier just rebuilt from scratch... which I had to do last week.

Ultimately, what's making me suspicious is when I upgraded to the new drive and unplugged all my non-m.2 satas, I also added some memory and a new power supply. But then after the upgrade (Monday of last week, so the 5th), the system wouldn't boot up. I used a usb to troubleshoot and my /boot partition was apparently no gouda. I redid that, and everything was fine... until this week. Then my new Games partition (basically the new drive) failed fsck and it got stuck in a boot loop on Tuesday. I could boot emergency to root, but not skip the fsck and keep the Games disk auto mounted (I know I changed something to randomize fsck on bootup, but that's something I'm still kinda looking into how I managed...), so I just removed it from my fstab and it booted fine. For two times. I just manually mounted the drive, all was great, then my SO sent me a screenshot today while I was at work stating that my / partition (on the older m.2) apparently rebooted because it bypassed my screen lock, and was stating EXT4-fs error, reading directory lblock:0 and whatnot.

So, that's my history on what's going on, and if anyone can offer any advice [mostly] on the backup stuff, though as I said, /home and the important tangible stuff is saved, but if you also have any input on something more than I suspect the drive is failing (since the /boot partition and now the / partition are crapping out), please feel free to share.

(Also, thanks for letting me in. This is what I'd typically post on reddit and probably have to repost 10 times depending on the sub to get the right keywords and tags and yes, I already searched the internet but my search will not match yours... sigh)

While pondering an off-grid microcontroller project, I got to wondering: A light sensor can obviously detect day vs night. So it could be used as a very cheap way to set a device's clock - but how accurately? To within an hour? A few minutes? How would you do it?

Questions that arose from this include:

• Should it detect dawn/dusk (light <-> dark transition), or noon/midnight (brighest/darkest time) ?
• How do dawn/dusk times relate to clock time? Does it depend on lat/long?
• If using dawn/dusk, what light level threshold to use?
• The same threshold for dawn & dusk, or different ones?
• Better to detect a darker threshold (start of dawn, end of dusk) or a lighter one?
• Some days will be lighter/darker than others, so how to manage averaging of times?
• How accurate could it be made?

My naïve first stab at this would be: Pick a light threshold. Record the dawn/dusk times according to that threshold. Average them, call that "noon", and gradually tweak the clock time over several days to bring it into line with the sensed/calculated "noon" - but a searching for graphs of sunrise/sunset times quickly showed that the midpoint of sunrise & sunset is not noon.

Googling threw up lots of results for sensor lights combining a clock and a photocell, but I couldn't find anything about using the photocell to set the clock. So does anyone know if this has been tried before? Is it a non-starter for some reason?

Edit:

Perhaps it's worth sharing the project I had in mind, which is a rain alarm so I can rush out and get the washing in from the line when it starts to rain. I was thinking how annoying it would be if I left it switched on and it rained in the middle of the night and the alarm woke me up. So I decided should automatically avoid triggering during the sleeping hours of night (say 10pm to 8am). My first thought was a photocell so it wouldn't trigger when it's dark. Then I remembered that it gets light at 3am at the moment, which wouldn't work. So it needs a clock. How to set the clock:

• Manually - Needs a user interface with buttons and a display. Seems overkill just for a clock.
• Serial port - Clunky to plug a laptop in just to set the clock.
• WiFi - Needs a username and password or WPS, and an ESP32 or similar - again seems overkill just to get the time.
• GPS - also overkill and expensive.

Hey,

I use Windows 10 and Arch in a dual boot configuration.

I use both of them for software development and want a shared partition to store all the projects.
Unfortunately, it's not as easy as I had thought.

Initially, I tried NTFS as the Linux support seemed fine. I tried both, ntfs-3g and the kernel implementation.
Besides the issue that hibernate could lock the drive - which you can disable - it periodically caused problems during compilation and other stages.

Especially Rust based projects have thrown weird errors during builds, but I also had this on certain Go projects as well.
It sometimes felt like, that the NTFS driver returned the wrong files when the compiler asked for them. Unmet dependencies, missing files, etc. Usually, when the project is huge.

In certain scenarios symbolic links didn't work and permissions were not set correctly - which you can fix by adding some args to the fstab mount - never got it really stable though.

I then tried to format to Ext4, and all issues were instantly gone on the Linux side.

Fortunately, there are tools such as Linux FileSystem from Paragon which promise to make it work (I even bought a proper license) - and it did for a while, until it didn't.

I once copied a bigger folder that included a bigger node_modules folder and during copy, files were missing, corrupted, the copy process hung - then crashed.

I was so desperate that I even tried out FAT32, but I quickly found out that it doesn't support symbolic links at all, and therefore breaks Git and other tools depending on it.

Is it still so hard in 2023 to have a shared partition between two OS? Has anyone made better experiences?
I really don't want to split the partitions as I sometimes work on the same project on different OSes.

Thanks in advance!